ReadPublicKey.java

KeyFactory keyFactory = KeyFactory.getInstance("RSA");

// Clean public key information
String publicKeyContent = new String(getBytesFromUri("id_rsa.pub"));
publicKeyContent = publicKeyContent
        .replace("----BEGIN RSA PUBLIC KEY----", "")
        .replace("----END RSA PUBLIC KEY----", "")
        .replace("\n", "");
LOG.info("Public key content: " + publicKeyContent);

// Get all bytes decoded from the public key content
byte[] publicKeyDecoded = Base64.getDecoder()
        .decode(publicKeyContent);

// Generate the public key object from bytes
X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(publicKeyDecoded);
PublicKey publicKey = keyFactory.generatePublic(publicKeySpec);